ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (183)
  • Ecology
  • Springer  (147)
  • Islamic Azad University, Science and Research Branch, Tehran, Marine Biology  (36)
Collection
Source
Keywords
Publisher
Years
Topic
  • 1
    facet.materialart.
    Unknown
    The zonation of soft-bottom sediments in Gorgan Bay (Caspian Sea) using macrobenthos as indicator of ecological health (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/18983 | 17408 | 2016-02-01 20:53:31 | 18983 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-12
    Description: In this study, in order to assess the ecological health status and zoning of soft bottom of Gorgan Bay, the spatial and temporal distribution of macrofauna and their relationship with environmental stress were investigated. Sediment samples were collected using a Van Veen grab at 22 sampling points, seasonally during 2012-2013. The averages (±SD) of the percentages of sand, silt, clay and TOM (Total Organic Matter) in the sediment samples were determined (44.4± 15, 53.4 ± 14, and 2.2 ±2.2 and 7.2% ± 1.6, respectively). Our results showed that mean (range) of Al, As, Cu, Fe, Ni, Pb and Zn in the sediment samples were 1.2 % (0.4-2.1), 4.8 (2.5- 10.3) ppm, 10.5 (4.4-16.9) ppm, 1 (0.4 – 1.6) % , 13.6 (6.2-21.5) ppm, 9.1 (4.7-12.9) ppm and 23.9 (3.1-39.4) ppm, respectively. In spring, both Al and Ni were higher than the guideline level. In the event that arsenic was exceeds the guidelines in summer. In this study, 14 species of macrofauna from 12 families were identified. Polychaeta with 3 species was the most dominant group in terms of abundance. The four most abundant taxa making up 85% of all specimens (Streblospio gynobranchiata, Tubificidae, Hediste versicolor and Abra segmentum). The western area were characterized by the higher species diversity (H', 1.94). So Gorgan Bay presents transitional macrobenthic assemblages that are spatially distributed along substrate gradients .The mean of Shannon index, BENTIX, BO2A, AMBI and M-AMBI in the bay was 1.3, 2.2, 0.4, 3.2 and 0.65 respectively. According to the results of these indices, ecological status of the western part of the bay assessed better than the other parts. According to the results of the nmMDS (non-metric Multidimensional Scaling), PCA (Principal Components Analysis), the map of distribution of heavy metals and the map of the ecological status , it seems Gorgan Bay is divided into two separate zones (the eastern and the western parts).M-AMBI finaly introduced reliable index for assessing the ecological status of the Bay.
    Description: PhD
    Description: Advisors:S.M.R. Fatemi, A. Machinchian Moradi Counsellors: R. Mousavi Nadushan, A.R. Sari
    Keywords: Ecology ; Environment ; Health
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 184
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    The study of biological characteristic and population dynamic of Caspian vimba (Vimba vimba persa), in coastal waters of Caspian Sea (Mazandaran Province) (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/19130 | 17408 | 2016-02-08 10:16:45 | 19130 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-13
    Description: This study was conducted to determine reproduction characteristics, diet regime, age structure and population dynamics parameters of the vimba vimba persa (Pallas, 1811) in Mazandaran waters of the Caspian Sea, from October 2008 to September 2009.A total of 994 specimens were monthly collected by beach seine and cast net from six fish landings of Ramsar, Tonekabon, Chaloos, Mahmood Abad, Sari and Behshahr.Biometric characters were measured for each specimen at the laboratory. Scales were used for age determination. Sex determination and fecundity were determined. Population dynamic parameters as well as stock assessment including cohort analysis were estimated using FISAT software. The finding showed that the mean of fork length and body weight of the Caspian Vimba were 168.4±2.6 mm and 71.94±32.24 g respectively. Strong correlation was found between these two variables (a= 0.012; b = 3.047; r2 = 0.955).92 specimens were studied from the fecundity point of view. This species was found to have more abundance in spring (esp. Apr-May). The samples composed of 397(42.6%) male, 537(57.4%) female; Overall sex ratio (M: F =1: 1.35) was significantly different from the expected 1:1 ratio (p ≤0.05).The advanced stages of maturity (4th & 5th) were found in April and May. The highest Gonadosomatic Index in female was in May and the lowest one was in July. This fish is therefore a spring spawner. The maximum absolute and relative fecundities were 34640 and 260.9, respectively; the minimum absolute and relative fecundities were 5400 and 94.5 respectively. The averages of absolute and relative fecundities were 17198±7710 and 171.85±48.8, respectively.Coefficient vacuity index was 59.2% which indicates that this fish is mesophagous. Among of living creature consumes by Caspian Vimba mollusks,76arthropods, worms, plants, detritus and fishes were found 32.9% , 26.7% , 13.4% , 17% , 4.4% and 1.6% respectively.The infinite fork lengths were 261 mm for females, 25mm for males and 261 mm for both sexes respectively. For population growth and mortality parameters; K ( 0.28 per year for both sexes, 0.3 per year for males, 0.33 per year for females); t0 ( -0.65 year for both sexes, -0.23 year in females, -0.51 year in males ); Φ' ( 2.28 ); Z ( 0.98 per year ); M ( 0.59 per year); F ( 0.39 per year) and Exploitation coefficient was 0.4.The analysis showed that total biomass and MSY were 1336 and 528.8 tonnes respectively.
    Description: PhD
    Description: Advisors:Gh. Vosoughi, F. Kaymaram Counsellors: Sh. Jamili, H. Fazli
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 77
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 3
    facet.materialart.
    Unknown
    Population dynamic and stock assessment of lobster resources of Cha-bahar region (with particular ref. to Panulirus homarus) (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/20251 | 17408 | 2016-03-01 14:34:57 | 20251 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-08
    Description: Amoungst the three spiny lobster species in southern Iranian waters, Panulirus homarus is the only commercial species with a total landings of 20-45 tons per year indicating a decrease in both landings and CPIJE in recent years. Fishing has been regulated according to the no. of fisherman and effort, and trap ha's replaced the gillnef since 1994. Fishing is carried out along the rocky shores of Chah-Bahar region through different landing places by local fisherman for a period of about two months. Most of catch is exported mainly frozen. This research was sposored by the Fisheries Research Dept. and aimed to work on the population dynamics and stock assessment in order to stablish a better understandings of the stock and hence a proper management in this region. Sampling was done for. 10 successive months in _5 major landing places from 1994 to 1995 with no sampling during the monsoon period through June to July. Althogethere, 8500 specimen were collected and the biometry was done accordings to the sex, region and month. Average total length, total weight and carapace length was obtained 216mm., 452 gr. and 75mm. respectively. Total length-weight relationship of both sexes was calculated and follows the cubic law. Regression coefficients for both sexes was 2.8231, males 2.9616, total females 2.7490, berried females 2.6611- and non-berried females
    Description: PhD
    Description: Supervisor: H. Emadi Advisors: A. Savari, B.H. Kiabi
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 314
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 4
    facet.materialart.
    Unknown
    Studies on distribution, diversity and production of macrobenthic fauna in the Chahbahar Bay (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/20256 | 17408 | 2016-03-01 14:44:58 | 20256 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-09
    Description: The population density, distribution, diversity and secondry production of macrobenthic fauna of the inner Chahbahar Bay were studied through bi-monthly sampling from April 1995 to March 1996. Samples were collected from water near the bottom and sediment at 14 stations inside the Bay and one reference station located outside at the entrance to the Bay. The environmental parameters Such as temperature, water depth, salinity, pH and dissolved oxygen as well as percentage silt-clay and total organic matter of the sediment were measured. The faunal population density and their distribution is discussed in relation to the environmental changes. results obtained indicated both spatial and temporal heterogeneity in faunal distribution of the Chahbahar Bay. The total of 18 groups of macrofauna were identified in all samples. Amphipods formed the dominant group (21%) followed by polychaetes (19%), gastropods (15.7%) bivalves (10.6%) and all other groups (33.7%). Seasonal changes in faunal density is shown in relation to Indian Ocean southwest monsoon,the result of which indicated lower population density during monsoon (June to September) than that of the premonsoon (February to May) and post monsoon (October to January) periods. The numerical abundance of macrobenthos varied from 10260.m2 before monsoon to 5190 m2 during monsoon season. Three dominant groups of macrofauna including polychaetes, gastropods, and bivalves were identified in all collected samples. Indices of diversity, richness and evenness were calculated for these three dominant groups. The Shannon-Weaver information index was used to describe the spatially and temporally variation in diversity of these three major faunal groups. The results exhibited lower faunal diversity during monsoon period. The annual production of two dominant macrofauna species including a species of bivalve, Nuculana acuta and a species of Cephalochordata, Branchiostoma lanceolatum were measured by using age group determination. Furthermore the mean biomass and total annual production of macrobenthic fauna were estimated for the whole studied area. The potential yield of demersal fishery resources (fish and crustacean) then estimated and worked out to be 15360 tons/year asuming 10% ecological efficiency of hypothetical pyramid from 3rd to 4th marine trophic level. Accordingly the annual exploitable demersal fishery resources for the entire Chahbahar Bay was estimated to be 7600 to 8500 tons/year by taking 50 to 55% of the total estimated potential in to account.
    Description: PhD
    Description: Advisors: A. Savary counsellors: H.Emady, M. Ahmady
    Keywords: Biology ; Ecology
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 223
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 5
    facet.materialart.
    Unknown
    Studies on Mahshahr Creeks macrobenthos with emphasis on their importance in fish feeding (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/20464 | 17408 | 2016-07-19 07:59:04 | 20464 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-10
    Description: To study the macrobenthic community at Mahshahr creek four Creeks namely Bihad, Doragh, Ghazaleh and Ghanam were chosen. Sampling was conducted on bimonthly basis and carried out from August 1996 to June 1997, 216 sediment samples were collected from 12 stations using 0.1 m^2 Van Veen Grab, The stations were located at the mouth, middle and the end of each Creek. In situ measurements of temperature pH, DO and salinity were done using different sensors. The samples for the measurements of TOM, grain size were collected and analysed in vitro. The results indicate spatial and temporal heterogeneity in the structure of macro faunal assemblages of the creeks. A total of 12 macrofaunal groups were identified within the study area. Amphipods were the most dominant group (43%) followed by polychaetes (42%), copepods (3.5%), tanaids (3.1%) and other groups (8.4%). The range for the numerical abundance of macrobenthos was between 12583 to 3648 individual per m2 and the variation was done to different bottom texture the variable environment conditions governing the different parts of each creek as well as within creeks. Application of diversity indices (Shannon H and Simpson indices) on the dominant macrobenthic assemblages (crustaceans & polychaetes) was varied between 1 to 2.5 being higher in Bihad and Ghanarn and much reduced Shannon H index or a higher Simpson in Ghazaleh. Probably brought about activities in this creek. Gut content analysis of four species of fish showed that the main food items consist of Crab, Shrimps and other crustacean species, The secondary production of macrobenthic fauna and hence a fish production were assessed. To do this first the production of most dominant species Apseudes sp. was computed through Cohort analysis. The total macrobenthic production was estimated and from this fish production was computed. The macrobenthic and fish secondary productions were 24300 tons/year) and 24300 (tons/year) respectively. These values were lower than those with similar areas in the Indian Ocean.
    Description: PhD
    Description: Advisors: A., Savari; Counsellors: A., Esmaili; G., Vosoughi
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 203
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 6
    facet.materialart.
    Unknown
    Studies on diversity of Hara's Laft - Khamir and Sout Beaches of the Gheshm polychaetes (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/20551 | 17408 | 2016-07-01 02:41:46 | 20551 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-11
    Description: One of the most important marine ecologic phenomenon, is the study of animal community among the bed or benthic fauna. Macrobenthoses are the great part of the benthic fauna that are more biomass than meiofauna and microfauna. To study polychaetes diversity of mangroves, located in Khoore-Khooran, sampling was conducted on a bimonthly and carried out from December 2001 to October 2002. Bottom samples were collected by Van Veen grab (0.025 m2) at 6 station from 2 transect in situ measurement of temperature, pH, DO and salinity were done. A total of polychaetes were identified within study 32 Family and 43 Genus. Cirriphormia and Nephtys were the most dominant genus in the studies. The range numerical abundance of polychaetes was between 3006 per m2 in the station A3 to 559 individual per m2 in the station A1 and the variation was done to different bottom, texture the variable environment conditions governing the different parts of each creeks as well as within creeks. Application of diversity indices (Shannon H') on the dominant polychaetes assemblages has higher H' in the Azar and lower H' in the Mehr and the stations B3 has the highest H' and the station A2 has the lowest H' Application of diversity and Richness, Evennes were studied and showed that the station A3 has the lowest evenness and the most individual, and station A I has the middle pollution.
    Description: PhD
    Description: Advisors: Emadi, H.; Counselors: Vosoughi, G., Nabavi, S.
    Keywords: Ecology ; Environment ; Fisheries
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 114
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 7
    facet.materialart.
    Unknown
    Identification, diversity and distribution patterns of fish larvae in Khark & Kharko Coralline Islands ecosystem – Persian Gulf, by GIS method (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/20890 | 17408 | 2016-07-04 00:24:21 | 20890 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-13
    Description: Khark & Kharko Islands are the last Northern point for fringing coral reefs in Iranian side of the Persian Gulf. These Coralline habitats are the Protected Area and Wildlife Refugees with the total area of 2400 ha which located in the territory of Bushehr Province. This research carried out during 2006-2007 with monthly sampling from 12 stations, which selected around Islandsand inshore waters with maximum depth of 20 meter. Sampling was conducted using by Bongo-Net plankton sampler with 500μ of mesh size. Totally, 1808 specimen from 45 family fish larvae was identified in studiedarea, including: 21 coralline fish larva families and 24 shore fish larvae such as pelagic and demersal fishes which some of them known as indicator, sentinel or endemic species for coral reef ecosystems. The results was shown that coral reef diversity in coral reefs (Khark & Kharko Islands) is more than other habitats such as estuary and river mouth, creeks, mangrove forest sites,and off shore water of the Persian Gulf and Oman Sea Iranian side. Among Identified families, Clupeidae, Blenniidae, Sillaginidae, Atherinidae and Tripterygiidae; with more abundance were dominant families in studied area. The pick of fish larvae abundance family were estimated in spring. There were significant differences between seasonally abundance and subareas, but there were not significant differences in diversity indexes between Khark and Kharko stations with coastal stations (p〈 0.05). The mean abundance of fish larvae were estimated 18.7083 larvae under 10m² of sea surface, and the mean diversity indexes and evenness wereestimated 0.7135 and 0.565342 consequently, that was showed the area is under ecological stress for fish larvae, and wasn’t stable. Therefore, from theecological point of view, only some of the fish larvae groups as like Clupeidae were dominant. Thus, they were the main cause of the fish larvae abundance change in studied area. Due to geographical location of Khark andKharko Islands and among the environmental parameters, Its seems that the condition of sea current is the main cause for present or absent and distribution patterns of fish larvae in area. Abundance of fish larvae in west of Islands was higher than eastern parts in the spring. But this condition will be reversed in eastern part of Island and several coastal stations, so that the Islands surrounding clock wise current to cause fish larvae distribution patterns.
    Description: PhD
    Description: Advisors: Vosoughi, Gh.; Fatemi, M.R.S.; Nikuian, A.R.; Jamili, Sh.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 332
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 8
    facet.materialart.
    Unknown
    Determination of biodiversity and spatial and temporal distribution pattern of demersal fishes in the Oman Sea (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/20951 | 17408 | 2016-08-10 01:00:36 | 20951 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-13
    Description: In this project, have been studied to determine the appropriate model to spatial, temporal and diversity of demersal fishes in the Sea of Oman, including Trichiuridae, Nemipteridae, Haemulidae, Arridae, Synodontidae, Batoidfishes, Carangidae, Scianidae, Carchariniformes and Serranidae. This research became operational from catch data during 2003 to 2013 (in 2007, due to the lack of ship failed). Processing and calculations was evaluated by using the software Excel, SPSS, Arc GIS and table curve 3D highest biomass and abundance was showed in strata A and C and 10-30 m depth layers was showed the best condition biomass. In other words, highest biomass was showed in the eastern region in the Oman Sea than the central and western regions. Batoidfishes and Trichiuridae had the highest biomass .Depth factors was showed a significant correlation with the biomass. Scianidae, Serranidae and Haemulidae were showed a large decline. Synodontidae was showed a very large increase. The largest of Shannon index belong to central and western region of the Oman Sea. The highest Shannon index was showed 10-20 and 50-100 m, respectively. The Distribution maps based on the biomass was analyzed by using Arc GIS software. So that were identified in the first time in a ten-year period and carefully catch stations any economic of aquatic group. In conclusion, the depth can be found in the pattern of distribution, abundance and diversity of fish from away the beach so that follow specific pattern.
    Description: PhD
    Description: Advisors: Toraj, Valinassab;Seid Mohammad Reza, Fatemi;Consulers: Shahla, Jamili;Babak, Moghaddasi
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 171
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 9
    facet.materialart.
    Unknown
    A survey on diversity and distribution of crabs in inter tidal and sub tidal shore of the Sistan and Baloochestan Province (Oman sea) (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/20952 | 17408 | 2016-08-10 01:01:34 | 20952 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-07-13
    Description: This project was done for identifying and survey on distribution and diversity of true crabs in inter tidal and sub tidal zones of the Gulf of Oman (Sistan and Baluchistan province) during two year from 2009 to 2010. Specimens of inter tidal zones were carried out at 10 stations and 8 stations from sub tidal. The specimens were collected by hand and dip-net from inter tidal and by trawl net from sub tidal regions, preserved in 70% alcohol and carried to the laboratory. A total of 37 species belonged to 17 families from inter tidal and 23 species belonged to 9 families from sub tidal were identified. Of which 54 species were identified up to species level. 2 species from Matutidae, 1 species from Eriphiidae, Menippidae, Pseudoziidae, Plagusidae, Varunidae, Camptandriidae, Dromiidae and Dorippidae, 2 species from Oziidae, 3 species from Epialtidae, 2 species from Majidae, 4 species from Pilumnidae, 12 species from Portunidae, 6 species from Xanthidae, 2 species from Grapsidae, 3 species from Dotillidae, 3 species from Macrophthalmidae, 3 species from Ocypodidae, 3 species from Calappidae, 2 species from Parthenopidae and 1 species from Galenidae were identified. All specimens are deposited in the Zoological Museum, University of Tehran (ZUTC). The results of the present study revealed that family Portunidae with 6 species from inter tidal and 9 species from sub tidal regions have the highest species richness among the 22 families. Maximum similarity (Sorenson's Index) was obtained among the stations Breis, Lipar, Pozm and Gordim, and minimum was obtained among the stations Chazire-Kharchang with Pasabandar, Beris, Lipar, Daria-Bozorg, Pozm and Gordim in intertidal regions. In sub tidal regions maximum similarity (Sorenson's Index) was obtained among the stations Pasa bandar with Berisand minimum was obtained among the stations Govatr with Ramin and Gordim, Ramin with Pozm. Also maximum species richness was observed at Tiss in inter tidal and Chabahar in sub tidal stations, whereas minimum was obtained at Beris, Pozm, Gordim and Lipar in inter tidal and Govatr and Pozm in sub tidal stations. Family Ocypodidae in inter tidal and Portunidae in sub tidal regions have the highest distribution. In all of the species length and Breadth of carapace showed significant relation.
    Description: PhD
    Description: Supervisors: S.M.R., Fatemi; Gh., Vosooghi; Consullators:T., Valinasab; A. Savari
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 307
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 10
    facet.materialart.
    Unknown
    Effects of hydrocarbons on reproductive physiology of the pearl oyster, Pinctada fucata (2021)
    Islamic Azad University, Science and Research Branch, Tehran, Marine Biology
    In:  http://aquaticcommons.org/id/eprint/19409 | 17408 | 2016-02-08 10:37:15 | 19409 | Islamic Azad University, Science and Research Branch, Tehran
    Details
    Publication Date: 2021-06-27
    Description: There are a lot of evidence that show hvdrocarbones cause some defect in reproduction and growth of bivalves. Bivalves are filter-feeder, thus accumulate more hydrocarbones in their tissue. In this study adult pearl producing oysters (Pinctada fucata) are used for all experimens. Samples of oysters, water and sediment from four natural beds; Nakhiloo (clean), Hendurabi (semipolluted), Lavan 1 (semipolluted) and Lavan 2 (polluted) were gatherd for 13 succesive months. Temperature, salinity, pH, oxygen and turbidity were recorded in each sampling. Oysters were kept in laboratory for adapation and then their length (DVM) were measured. Hemolymph samples were collected by insuline syring. Sediments and soft tissues of oysters were dissolved in carbon tetrachloride and when heated to extract oil hydrocarbones. UV, GC and IR were used to assay oil hydrocarbones. Accumulation of hydrocabones in soft tissue were as follows : Kakhiloo〈Hendurabi〈 Lavan 1〈Lavan 2 Regarding water, pollution in Lavan was more than Nakhiloo and Hendurabi, however due to water currents and closeness of Lavan 1 and Kakhiloo station to the coast pollution was less than Hendurabi. Results showed that there is not meaningful difference (P〈0.05) between sexual hormones in males and femals. Concerning progesterone cycle, there are two peak of spawning in oysters, major one in late spring and minor one in mid fall. Little elevation of progesterone start gamete and a lot of elevation release gametes_ Esteradiols gradually increase during gametogenesis and reach to maximum level during vitellogenesis. Testosterone have a synergestic role which esteradiol during vitellogenesis and also is effective in male sexuality. Multi regression test showed that there isn't meaning relationship (P〈0.05) between hydrocarbones pollution and esteradiols. However in Lavan 2 due to hormone concentration of hydrocarbones had some effect in sexual hormonal cycles. Turbidity was the most effective factor for releasing of progesterone. Progesterone was a stimulating factor for releasing estradiol also release of testosterone was corrolated with oxygen and depth of beds. One way analysis of variance showed that there is not significant relasionship (P〈0.05) between different factory in stations.
    Description: PhD
    Description: Advisor:Sh. Oryan Counsellors: A. Savari, Gh. Amini Ranjbar. The full text document is in Farsi only so it has not been possible for AC Editors to check the metadata input.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 237
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...